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                               (with regard to the well-known history…)

How many grains of rice can go in a Chessboard, if we place one grain in the first square, two in the second, four in the third and so on ?
The exact  formula is 2⁶⁴-1, wich we can round up to 2⁶⁴.

We can then make the following calculations:

• Rice grains on the chessboard = 2⁶⁴ = 1,84467*10¹⁹
  rounded up (to) 1,85*10¹⁹

• If we agree that 1 grain = 0,1 g = 10^-4 kg. = 10^-7 Tons,
  the total Weight  would be
  W = 1,85*10¹⁹*10^-7 = 1,85*10¹² T. = 1,85 millions of millions of tons. 

• If we fix its value to a dollar by kg., its total value would be 
  = 1,85 millions of billions of dollar!                              ( for 1 billion = 10⁹ units )     

• If we agree that 1 kg of rice = 1 liter = 1 dm³,       
  the total volume would be 1,85*10¹² m³ =1,85 millions of millions of m³. 

•  If this volume were distributed on a square of  m. 1.85 height, 
  their dimensions would be of 1000*1000 km.  

•  If the rice layer had a height of mm 18,5, 
  their dimensions would be of  10.000*10.000 km = 100 million of km².

•  If the rice layer had a height of mm 3.7, the same one would be sufficient to cover the whole terrestrial surface, sea including.

•  If we had to use that rice to feed to us, each inhabitant of our planet would have 264 tons, and all the humanity could feed itself during thousand years.

•  Calculating in 5 mm the length of each grain, the grains of a board, placed one behind the other, would have a length of 9,25*10¹⁹ mm =  92,500 millions of millions km, that is near 10  light-years, a length more than sufficient to cover the distance Earth - a Centauri and return !

• And finally, if we decided to count one by one the grains of rice with a speed of one grain per second, the necessary time would be of more than 53 billions of years, 4 times the age of the universe !
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